Reduction the Dead-Time Effects on the Inverter in Renewable Energy Conversion Systems by Applying Sliding Mode Control
2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)(2020)
摘要
Even though dead-time prevents shoot-though in grid-tied inverters, it has some drawbacks, such as the harmonic distortion of inverter output voltages. This voltage distortion can spread into the inverter output currents if dead-time effects are not considered by the control system. Rejecting dead-time effects permits to improve the energy quality delivered into the grid by renewable energy conversion systems, which is an important concern. Therefore, to reduce dead-time effects on three-phase grid-tied inverters, a super-twisting sliding mode control algorithm is proposed in this paper. This algorithm has the following advantages: robustness against grid frequency variations, low chattering, and fast dynamics. To highlight these advantages, the proposed algorithm is compared against PI control. Simulation results of a three-phase grid-tied inverter switched at 40 kHz demonstrate how the proposed algorithm maintains the inverter output current TRD at 0.8%, when deadtime is equal to 1 μs, meeting Std IEEE 1547.
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关键词
renewable energy conversion system,sliding mode control,super-twisting controller,three-phase inverter,dead-time
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